Investor Whitney Tilson was just on CNBC talking about how investing in BP — and other stocks in free fall — are great value buys. But Tilson said that he would avoid three companies: Nokia, Research in Motion, and First Solar

Shares of AT&T Inc. were up close to 1% after markets opened Thursday after JPMorgan upgraded the stock to overweight from neutral on the prospect of better-than-expected revenue growth in the company's wireless business